I'll say this...
I had an IMMENSE amount of respect for Michael Jordan when he bowed out. It was a HUGE deal! That man was a basketball god. When he came back, I lost all that respect. You can't get everyone all riled up and upset and let them have goodbye parties and express all their "I'm sad you're leaving" thoughts and feelings and then decide "Ya know, I don't think I'm done."
If Favre never signs those papers, I'm a happy man. But, if he signs the retirement papers and in 6 months goes "Maybe I'm not done," I'll be a little upset that he let us get all emotional over his retirement and then goes "Haha!! August fools!! I'm back!"